Tinea Pedis (Athlete's Foot) and Onychomycosis

Tinea pedis (athlete's foot) is a common fungal condition occuring in the feet of athletes or workers who routinely wear their shoes without drying and cleaning them properly. Although it is more common to find the itchy, scaly (not always) and smelly skin lesion in between the toes, they can also infect the sole of the foot. Athletes who have the habit of wearing shoes belonging to their team mates may transmit the disease to others. This condition is easy to treat with foot hygiene, topical anti-fungal creams and occasionally require oral anti-fungal medication.

The nails may also be infected (see 2nd photo) causing Onychomycosis. This condition is more difficult to treat often requiring oral anti-fungal medication, topical anti-fungal lotion after filing the infected nail.

Links of interest:-
Athlete's Foot: MayoClinic.com
Nail Fungus